How is pure alumina obtained from bauxit...

How is pure alumina obtained from bauxite by leaching process.

Text Solution

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` Al_(2)O_(3)+ 2NaOH + 3H_(2)Oto 2Na[Al(OH)_(4)]`
`2NaAl(OH)_(4) +CO_(2) to A1_(2)O_(3), xH_(2)O+ 2NaHCO_(3)`.
`Al_(2)O_(3), xH_(2)tounderset(1470K)(Al_(2)O_(3)+xH_(2)O`

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The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by Hall process is:

180 kg

270 kg

540 kg

90 kg

Pure nitrogen gas is obtained from

`NH_(3)+NaNO_(2)`

`NH_(4)Cl+NaNO_(2)`

`N_(2)O+Cu`

`(NH_(4))_(2)Cr_(2)O_(7)`.

Aluminium is most abundant in earth crust yet it is obtained from bauxite because

bauxite is available in large quantity

of easy extraction of aluminium from it

bauxite contains maximum aluminium

bauxite is less impure